Consolidated Statements Of Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Dividend declared per common share	$ 0.2343	$ 0.2190	$ 0.2190	$ 0.219	$ 0.2047	$ 0.2047
Stock issued for acquisition, shares		37,370,017
Issuance of common stock under dividend reinvestment plan, shares	9,334	10,162	117,845	10,693	10,918	11,252
Repurchase of stock, shares	189	46	52,124	25		71,940
Equity compensation plan, shares	4,165	5,099	134,257	4,423	3,969	181,670
Exercise of stock options, shares	9,864	21,148	77,479	11,877	411	62,688
Common Class A [Member]
Issuance of common stock	29,484